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220 lines
6.4 KiB
220 lines
6.4 KiB
/* |
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* FLI/FLC Animation File Demuxer |
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* Copyright (c) 2003 The ffmpeg Project |
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* |
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* This library is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2 of the License, or (at your option) any later version. |
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* |
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* This library is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with this library; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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*/ |
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/** |
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* @file flic.c |
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* FLI/FLC file demuxer |
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* by Mike Melanson (melanson@pcisys.net) |
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* for more information on the .fli/.flc file format and all of its many |
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* variations, visit: |
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* http://www.compuphase.com/flic.htm |
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* |
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* This demuxer handles standard 0xAF11- and 0xAF12-type FLIs. It also |
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* handles special FLIs from the PC game "Magic Carpet". |
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*/ |
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#include "avformat.h" |
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#define FLIC_FILE_MAGIC_1 0xAF11 |
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#define FLIC_FILE_MAGIC_2 0xAF12 |
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#define FLIC_CHUNK_MAGIC_1 0xF1FA |
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#define FLIC_CHUNK_MAGIC_2 0xF5FA |
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#define FLIC_MC_PTS_INC 6000 /* pts increment for Magic Carpet game FLIs */ |
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#define FLIC_DEFAULT_PTS_INC 6000 /* for FLIs that have 0 speed */ |
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#define FLIC_HEADER_SIZE 128 |
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#define FLIC_PREAMBLE_SIZE 6 |
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typedef struct FlicDemuxContext { |
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int frame_pts_inc; |
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int64_t pts; |
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int video_stream_index; |
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} FlicDemuxContext; |
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static int flic_probe(AVProbeData *p) |
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{ |
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int magic_number; |
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if (p->buf_size < 6) |
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return 0; |
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magic_number = LE_16(&p->buf[4]); |
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if ((magic_number != FLIC_FILE_MAGIC_1) && |
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(magic_number != FLIC_FILE_MAGIC_2)) |
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return 0; |
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return AVPROBE_SCORE_MAX; |
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} |
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static int flic_read_header(AVFormatContext *s, |
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AVFormatParameters *ap) |
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{ |
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FlicDemuxContext *flic = (FlicDemuxContext *)s->priv_data; |
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ByteIOContext *pb = &s->pb; |
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unsigned char header[FLIC_HEADER_SIZE]; |
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AVStream *st; |
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int speed; |
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int magic_number; |
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flic->pts = 0; |
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/* load the whole header and pull out the width and height */ |
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if (get_buffer(pb, header, FLIC_HEADER_SIZE) != FLIC_HEADER_SIZE) |
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return -EIO; |
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magic_number = LE_16(&header[4]); |
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speed = LE_32(&header[0x10]); |
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/* initialize the decoder streams */ |
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st = av_new_stream(s, 0); |
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if (!st) |
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return AVERROR_NOMEM; |
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flic->video_stream_index = st->index; |
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st->codec.codec_type = CODEC_TYPE_VIDEO; |
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st->codec.codec_id = CODEC_ID_FLIC; |
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st->codec.codec_tag = 0; /* no fourcc */ |
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st->codec.width = LE_16(&header[0x08]); |
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st->codec.height = LE_16(&header[0x0A]); |
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if (!st->codec.width || !st->codec.height) |
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return AVERROR_INVALIDDATA; |
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/* send over the whole 128-byte FLIC header */ |
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st->codec.extradata_size = FLIC_HEADER_SIZE; |
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st->codec.extradata = av_malloc(FLIC_HEADER_SIZE); |
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memcpy(st->codec.extradata, header, FLIC_HEADER_SIZE); |
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av_set_pts_info(st, 33, 1, 90000); |
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/* Time to figure out the framerate: If there is a FLIC chunk magic |
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* number at offset 0x10, assume this is from the Bullfrog game, |
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* Magic Carpet. */ |
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if (LE_16(&header[0x10]) == FLIC_CHUNK_MAGIC_1) { |
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flic->frame_pts_inc = FLIC_MC_PTS_INC; |
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/* rewind the stream since the first chunk is at offset 12 */ |
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url_fseek(pb, 12, SEEK_SET); |
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/* send over abbreviated FLIC header chunk */ |
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av_free(st->codec.extradata); |
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st->codec.extradata_size = 12; |
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st->codec.extradata = av_malloc(12); |
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memcpy(st->codec.extradata, header, 12); |
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} else if (magic_number == FLIC_FILE_MAGIC_1) { |
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/* |
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* in this case, the speed (n) is number of 1/70s ticks between frames: |
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* |
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* pts n * frame # |
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* -------- = ----------- => pts = n * (90000/70) * frame # |
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* 90000 70 |
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* |
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* therefore, the frame pts increment = n * 1285.7 |
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*/ |
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flic->frame_pts_inc = speed * 1285.7; |
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} else if (magic_number == FLIC_FILE_MAGIC_2) { |
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/* |
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* in this case, the speed (n) is number of milliseconds between frames: |
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* |
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* pts n * frame # |
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* -------- = ----------- => pts = n * 90 * frame # |
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* 90000 1000 |
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* |
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* therefore, the frame pts increment = n * 90 |
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*/ |
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flic->frame_pts_inc = speed * 90; |
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} else |
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return AVERROR_INVALIDDATA; |
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if (flic->frame_pts_inc == 0) |
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flic->frame_pts_inc = FLIC_DEFAULT_PTS_INC; |
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return 0; |
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} |
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static int flic_read_packet(AVFormatContext *s, |
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AVPacket *pkt) |
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{ |
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FlicDemuxContext *flic = (FlicDemuxContext *)s->priv_data; |
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ByteIOContext *pb = &s->pb; |
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int packet_read = 0; |
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unsigned int size; |
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int magic; |
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int ret = 0; |
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unsigned char preamble[FLIC_PREAMBLE_SIZE]; |
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while (!packet_read) { |
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if ((ret = get_buffer(pb, preamble, FLIC_PREAMBLE_SIZE)) != |
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FLIC_PREAMBLE_SIZE) { |
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ret = -EIO; |
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break; |
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} |
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size = LE_32(&preamble[0]); |
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magic = LE_16(&preamble[4]); |
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if ((magic == FLIC_CHUNK_MAGIC_1) || (magic == FLIC_CHUNK_MAGIC_2)) { |
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if (av_new_packet(pkt, size)) { |
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ret = -EIO; |
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break; |
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} |
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pkt->stream_index = flic->video_stream_index; |
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pkt->pts = flic->pts; |
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memcpy(pkt->data, preamble, FLIC_PREAMBLE_SIZE); |
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ret = get_buffer(pb, pkt->data + FLIC_PREAMBLE_SIZE, |
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size - FLIC_PREAMBLE_SIZE); |
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if (ret != size - FLIC_PREAMBLE_SIZE) { |
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av_free_packet(pkt); |
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ret = -EIO; |
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} |
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flic->pts += flic->frame_pts_inc; |
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packet_read = 1; |
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} else { |
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/* not interested in this chunk */ |
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url_fseek(pb, size - 6, SEEK_CUR); |
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} |
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} |
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return ret; |
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} |
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static int flic_read_close(AVFormatContext *s) |
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{ |
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// FlicDemuxContext *flic = (FlicDemuxContext *)s->priv_data; |
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return 0; |
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} |
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static AVInputFormat flic_iformat = { |
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"flic", |
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"FLI/FLC animation format", |
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sizeof(FlicDemuxContext), |
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flic_probe, |
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flic_read_header, |
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flic_read_packet, |
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flic_read_close, |
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}; |
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int flic_init(void) |
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{ |
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av_register_input_format(&flic_iformat); |
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return 0; |
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}
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